Four Stage Filtration without the UV (Ultraviolet) Blended oxidizing carbon media for maximum reduction of chemicals, gases and odors (15 pounds).Non-outgassing Bio-HEPA (80 sq.ft.) Particulate microfiltration provides 99.6% reduction of particles, molds, pollen and dirt as small as 0.3 microns. Spin polyester prefilter is impregnated with carbon to absorb additional odors, dander, hair and particulates as small as 10 microns. Can be cleaned for repeated use. Carbon impregnated polyester postfilter for final absorption so contaminates don't spill out into the air.Classes of Contaminants: